High-resolution distributed model to simulate erosion and sedimentation in a steep basin: a case study of the Akatani River Basin, Kyushu, Japan

IF 0.6 Q4 WATER RESOURCES Hydrological Research Letters Pub Date : 2020-01-01 DOI:10.3178/hrl.14.97
Luis Z. Chero, Y. Tachikawa
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Abstract

: In this study, we developed a distributed rainfall-runoff and sedimentation model based on one-dimensional kine‐ matic wave equations. Physically-based rainfall-runoff and erosion-sediment processes were coupled and solved for each spatial grid, whilst the spatially distributed grids were connected to each other to allow for space-and-time move‐ ments of water and sediment. The model was applied to the Akatani River basin of the Chikugo River in Kyushu, Japan using a 10 m high-resolution digital elevation model and eXtended RAdar Information Network (XRAIN) data as a time-and-space distributed rainfall input of the northern Kyushu heavy rainfall event in July 2017. Our results indi‐ cate that the rainfall-runoff hydrograph and sediment flow results are in agreement with the collected field data, and elevation of the river bed after the disaster was successfully reproduced by applying a sediment theory to estimate river bed variation. In addition, we found that sediment transport results are sensitive to model spatial resolution. Our simu‐ lation model is intended for use with basins that feature steep slopes and are prone to erosion and shear strength reduction after heavy rainfall events. Hence, this model can be applied to give early warnings by identifying critical erosional areas during forecasted heavy rainfall events.
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模拟陡峭盆地侵蚀和沉积的高分辨率分布式模型:以日本九州赤谷河流域为例
在这项研究中,我们建立了一个基于一维曲线波动方程的分布式降雨-径流和沉积模型。基于物理的降雨-径流和侵蚀-泥沙过程对每个空间网格进行耦合和求解,而空间分布的网格相互连接,以允许水和泥沙的时空移动。该模型应用于日本九州赤谷河流域,采用10米高分辨率数字高程模型和扩展雷达信息网络(XRAIN)数据作为2017年7月九州北部强降雨事件的时空分布降雨输入。我们的研究结果表明,降雨-径流水文图和泥沙流结果与收集的现场数据一致,并且通过应用泥沙理论来估计河床变化,成功地再现了灾害后的河床高程。此外,我们发现泥沙输移结果对模式空间分辨率很敏感。我们的模拟模型适用于坡度陡峭且在强降雨事件后容易发生侵蚀和抗剪强度降低的流域。因此,该模型可用于在预测强降雨事件时识别临界侵蚀区域,从而进行早期预警。
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来源期刊
CiteScore
1.90
自引率
18.20%
发文量
9
审稿时长
10 weeks
期刊介绍: Hydrological Research Letters (HRL) is an international and trans-disciplinary electronic online journal published jointly by Japan Society of Hydrology and Water Resources (JSHWR), Japanese Association of Groundwater Hydrology (JAGH), Japanese Association of Hydrological Sciences (JAHS), and Japanese Society of Physical Hydrology (JSPH), aiming at rapid exchange and outgoing of information in these fields. The purpose is to disseminate original research findings and develop debates on a wide range of investigations on hydrology and water resources to researchers, students and the public. It also publishes reviews of various fields on hydrology and water resources and other information of interest to scientists to encourage communication and utilization of the published results. The editors welcome contributions from authors throughout the world. The decision on acceptance of a submitted manuscript is made by the journal editors on the basis of suitability of subject matter to the scope of the journal, originality of the contribution, potential impacts on societies and scientific merit. Manuscripts submitted to HRL may cover all aspects of hydrology and water resources, including research on physical and biological sciences, engineering, and social and political sciences from the aspects of hydrology and water resources.
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